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Yes.For 30 subnet we need to borrow 5 bits from the host portion i.e 2^5=32 which stisfies our requirement of 30 subnets So /29 or 255.255.255.248 is the required subnet.
As Block Size of the subnet is 8 (256-248) ,its subnet ranges will be in the dfference of 8 i.e 0-7,8-15.......24-31.....32-39.......247-255.
So,Yes..........203.10.93.30 is a valid id host in the fourth ...
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